Exposomics and India's Environmental Disease Burden: Need for Holistic Risk Assessment

The Hindu - Opinion · 6 Jun 2026 · 2 min read
Prelims · Environment Mains · GS3 Environment and biodiversity High relevance

India accounts for 25% of global environmental disease burden, necessitating adoption of 'exposomics'—a comprehensive approach integrating environmental, genetic, and lifestyle factors—to develop effective prevention strategies and reduce health inequities.

Key points

Environmental Disease Burden: India faces nearly 3 million deaths annually from occupational and environmental health (OEH) risks, contributing over 50% to non-communicable diseases like heart disease, stroke, and diabetes.

Global Burden of Disease (GBD): The 2021 GBD study identified OEH factors causing 18.9% of global deaths (12.8 million), with ambient PM2.5 (4.7 million deaths) and household air pollution (3.1 million deaths) as leading risks.

Data Gaps: Current GBD assessments cover only ~11 environmental risk factors, excluding microplastics, chemical mixtures, and noise pollution due to lack of exposure data, resulting in conservative underestimates.

Climate Change Multiplier: [GS3-Environment] Rising temperatures amplify existing risks like air pollution, vector-borne diseases, and food insecurity, while worsening mental health outcomes through ecological distress.

Exposome Concept: Unlike genomics which explains <50% of heart disease risk, exposome analysis tracks lifetime environmental exposures (chemical, physical, social) to better predict disease etiology.

Health Surveillance: Strategic investments needed in integrated monitoring combining biomonitoring, digital health platforms, and data science to map complex exposure-disease relationships.

Policy Fragmentation: Current siloed approaches to air/water/sanitation exacerbate health inequities; requires inter-ministerial coordination between Environment, Health, and Urban Development ministries.

[GS2-Governance] Institutional Capacity: India lacks a centralized environmental health agency; NCDC and ICMR need exposome research wings modeled after US National Institute of Environmental Health Sciences.

Way Forward: Establish a National Exposome Research Initiative under PM-SHRI, mandate industry-funded biomonitoring for chemical regulation, and integrate climate-health vulnerability mapping into National Action Plan on Climate Change (NAPCC).

Key terms

Global Burden of Disease (GBD)

A systematic scientific effort by WHO and IHME to quantify health loss from diseases, injuries, and risk factors across populations. UPSC relevance lies in its use for evidence-based policymaking, particularly in prioritizing interventions for SDG 3 (Good Health) and environmental health targets.

Disability-Adjusted Life Years (DALYs)

A metric combining years of life lost to premature mortality and years lived with disability. For UPSC, it's critical for cost-benefit analysis of health programs (GS2) and assessing climate change impacts (GS3), with 1 DALY = 1 lost year of healthy life.

PM2.5

Particulate matter ≤2.5 micrometers in diameter, primarily from combustion sources. Constitutionally significant under Article 21 (Right to Life) via judicial interpretations; causes 4.2% of India's DALYs (GBD 2021), making it central to environmental policy and public health questions.

Exposome

The cumulative measure of all environmental exposures (physical, chemical, biological, social) an individual encounters from conception onward. For UPSC, it represents a paradigm shift from disease treatment to prevention by identifying root environmental causes, crucial for GS3 environmental governance and GS2 public health questions.